Of this harbour is the Capo Caccia, with two stalactite grottos, the finest of which, the Grotta di Nettuno, is accessible only from the sea.
Amongst the best-known are the grottos of Adelsberg, the larger ones of Planina and the Kreuzberghohle near Laas.
The cathedral, of the 12th century, has a carved portal and three apses decorated with small arches and pilasters, and contains a fine pulpit and episcopal throne in marble mosaic. Near it are two grottos 1 To the period after 335 belong numerous silver and bronze coins with the legend Caleno.
At Syracuse also there are very extensive catacombs known as " the Grottos of St John."
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